On 14 May 2014 12:02, Jyri Sarha <jsarha@xxxxxx> wrote: > On 05/13/2014 12:13 AM, Joachim Eastwood wrote: >> >> On 12 May 2014 11:12, Jyri Sarha <jsarha@xxxxxx> wrote: > > ... > >> >> hey, this worked straight away :) >> >> But there seems to be something wrong with the channel mapping. >> >> For stereo (speaker-test -c 2) the mapping is correct. >> >> But for -c 4 and -c 8 it gets weird: >> speaker-test -c 4 -s X # where X is 1-4 >> 1: Front Left is Rear Left >> 2: Front Right is Rear Right >> 3: Rear Right is Front Right >> 4: Rear Left is Front Left >> >> speaker-test -c 8 -s X # where X is 1-8 >> 1: Front Left is Rear Left >> 2: Center is Rear Left >> 3: Front Right is Rear Right >> 4: Side Right is Front Right >> 5: Rear Right is silent >> 6: Rear Left is Center >> 7: Side Left is Front Left >> 8: LFE - Rear Right >> >> I think you need to check what channel order ALSA expects. I believe >> speaker-test does the right thing on my HTPC normally connected to my >> receiver. >> > > I checked the implementation and there was indeed something weird there, but > the implementation can not explain the FL and FR channels jumping around. FL > and FL should always be the first two channels in all configurations and the > implementation does not touch them. > > The implementation uses 8ch HDMI setup for anything above 2ch with "Audio > InfoFrame Data Byte 4" set to 0x13. According to CEA-861 specs this means > following channel order: FL, FR, LFE, FC, RL, RR, RLC, RRC > > This is a closest match to ALSA 8ch mapping (according to > sound/core/pcm_lib.c) which is: FL, FR, FC, LFE, RL, RR, SL, SR hm, okey. I haven't look at the code but it do seem strange. But with speaker-test -c 4 the front and back are surely swapped here. I'll do some more testing and also check with my HTPC. btw, I only have a 5.1 setup over here so I can't test all the discrete channels. > Current implementation has FLE and FC channels correctly swapped, but it > shifts them to last two channels and RL, RR, SL, SR are shifted down to fill > the place. This is all wrong and I'll try to come up with a fix for that. > Unfortunately I can not test anything beyond 2 ch myself so I would need > someone to volunteer to test my patch. I have the dev kit setup up over here so I can test your patches. regards Joachim Eastwood -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
